We tend to think of chickens as being stupid. They are not, they actually seem to have a pretty good memory in my opinion. For example.
My broody chicken was out of the pen, in my little protected nesting box for about 6 weeks total. Outside of the main pen.
When we put her and the chicks in the pen, the FIRST thing she did, is ran into the pen, and get a pellet of food, and run back out to her chicks and break it in half for them.
She remembered where the food was after being gone for a month and a half.
Also the first night she tried to roost where she used to roost. In the coop on the first rung of her roost.
Then I took her and the babies out and put them back in the little pen so they could stay under her, and that one time I moved her has been enough.
-----------------Enough of the story-------------------
My suggestion: Watch the sun, and when they are going in to roost, watch the youngsters. When they move into the nesting box, just show them to the roost, and help them up on to it. Put them kinda high on it, cause chickens seem to like it the higher the better.
Do this for a few days, and you may realize they can learn.
Remember they are teenagers, and just don't know what to do. Show them, you will be surprised how fast they learn. I WAS SHOCKED. I THOUGHT CHICKENS WERE BORDER LINE RETARDED, UNTIL I started raising them as a adult.